Dorsal spines: 3; Dorsal rays: 30-35; Anal spines: 0; Anal rays: 28-31.
A dark greenish-black to purplish triggerfish with pale blue lines along the bases of the soft dorsal and anal fins. Submarginal blue line on caudal fin bends into lobes. Blue disappears with death, leaving black fish with white line along base of soft dorsal and anal fins. The scales on the rear of the body have prominent keels that form longitudinal ridges.
Maturity: Lm unknown. Range unknown. Max Length: 50cm TL.
Habitat and Ecology:
Inhabit upper reef edge of outer slope of seaward reefs (depth 0-75m usually 0-20m) often in small loose aggregations. Classified as a planktivore but has very variable diet including benthic algae and drifting offal. The fact it is caught in the hand line fishery reflects this diverse diet.
This species is not protected or subject to fishery regulations. It is caught in the hand line fishery but is a rare component of the catch.
Similar to the Indian triggerfish (Melicthys indicus), that may occur in Seychelles waters but has yet to be documented, which has a rounded caudal fin with narrow white margin.
Bray, D.J. 2016. Melichthys niger in Fishes of Australia, accessed 31 Oct 2018, http://fishesofaustralia.net.au/home/species/764
Froese, R. & D. Pauly. Eds. 2018. FishBase https://www.fishbase.de/summary/melichthys-niger (31/10/18)
Liu, J. et al 2015. Melichthys niger (errata version published in 2016). The IUCN Red List of Threatened Species 2015: e.T193609A97666184. Downloaded on 31 October 2018.